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UNITED STATES nanny c. LoNsnALE, or RANGER, muxas.

coLLAn BURSTER.

Specicat'ion of Letters APatent. Patented Jan, 17; 1922,

Application led July 29, 1921.' Serial No. 488,371.

To all whom it mag/Focaccia:

Be it known that I, HENRY C.- LoNsDAL'E,

a citizen of theA UnitedStates of America,

residing at Ranger, in the county of Eastland and State of Texas, have invented certain new and useful Improvements in Collar Bursters, of which the following is a specification.

My invention relates to a tool for use in drilling wells for oill or water and more particularly to a collar burster; and the object is to provide a useful tool for bursting.

the collars off of pipe sections which are to be removed from the wells and to provide a tool which can be furnished at relatively small costs and to provide a tool which will be strong and accurate and eilicient in operation and by which the collars can be readily broken from the pipe sections. Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings which form a part of this application.

Fi 1 is a side elevation of the tool assemb ed. Fig. 2 is a side elevation, partly in sectionand at right angles tothe view shown in Fig.A 1 and showing sectionsof pipe and collar connecting the sections. Fig.

usual connection2 for a drilling tool. Av

discharge pipe is shown in sections 3 connected by a collar 4. Thel collar 4 is the thing to be broken out or bursted in order that the pipe sections may be separated and drawn out of the Awell section by s ection without having to lift a whole column. The

knives or blades 5 lare mounted in sockets in the head and are retained in the head by pivot bolts 6, but there is no strain on the pivot bolts in an operation of bursting a collar because the strain is takenup' by the curved sockets in the head 1 and the base end of the blades are curved for this pur pose.` When the tool is' being let down in the well, the points of the blades will swing upwardly and almost within the openings 7. l

eans are provided for actuating the blades 5. Actuating and guide springs 8 are attached to a plunger rod 9 at their lower ends and the upper ends are slotted, the same as springs 16 asshown in Fig. 3, so that the upper ends of the springs, 8 will engage the guide pipe 10 loosely. The springs 8 are positioned on a rod or bolt 11 by means of nuts 13, washers 14, and nuts 15. The bolt 11 projects through the lower end of the plunger rod 9 and through an elongated slot 12 in the guide pipe 10. The rod 11 must move freely vertically Ain the guide pipe and the springs 8 are prevented from binding on the guide pipe 10 by the nuts- 13. There is provided a yoke for actuating the blades 5. This yoke consists of a bar 18 which is attached to the upper end of the plunger 9 and link rods'or wires 1 9 are connected to the yoke 18 and pivot/ally connected to the blades 5, slots being cut in the blades for the rods 19. The springs 8 serve two purposes and these are to center the tool in the pipe sections 3 and to serve as friction devices to pull or swing the blades outwardly when the head starts upwardly so' that when the blades 5 pass above the lower pipe section, they will be swung outwardly between the ends of the pipe sections and against the collar 4. As force is 'applied t0 draw the head upwardly, the blades 5 will break or burst the collar 4 so that the section of ptipe .above the collar can be drawn out of the Well. The head 1 is cut away sufliciently for the movement of the operating yoke which consists of the bar 18 and .link wires or rods 19 which are connected to the blades. Other guide springs- 16 are provided for centering the tool in the Well. These springs 16 have large slots 17 yso the springs will move freely laterally on 4the guide pipe 10.

The operation of the tool is lcarried out by letting the head down in the well pipes until itl passes below the end of -a pipe section which is to be removed. The head will have to be let down far enough forY the blades' to pass below the end of the section of pipe to be removed. The head is then drawn upwardly. The friction of the springs 8 against the casing 3 will cause the plunger and yoke to swing the blades 5 outwardly against the collar 4 by dropping into the annular space between two sections of pipe. The blades cannot slide on the interior of the collar further 'than the end of the pipe section above the collar. When force 1s applied to draw the head upwardly, the blades break the collar and so release the thepipe section whichcan then be drawn out. With this tool the collars can be readily broken and -the pipe `sections removed one at a time. It is apparent that various changes in the sizes, construction, and arrangement -of the A,several parts can be made "hwithout departing from my invention as set forth in the clalms.

What I claim,.is,-

1. A collar burster comprising an o erating head having a relatively large s ot in the lower part thereof, a depending socket member formed in said head and projecting downwardly in said slot and having sockets formed therein, blades pivotally mounted in' f said socket with their cutting edges' normally elevated above their pivotal connections, said socket member serving to drive said blades upwardly and outwardly when said head is elevated, and yielding means for pressing said blades outwardly.

2. A collar burster comprising an operating head having sockets formed in the sides thereof, .breaking .blades pivotally mounted in' 'said sockets with their cutting edges elevated about theircpivotal connections, said head havin curved bearing members supporting sai blades for driving said blades upwardly, andA means for pressing said blades outwardly when said head is elevated.

3. A collar burster comprising an operate ing head having sockets formed in the sides thereof, breaking blades pivotally mounted in said sockets with their cutting edges elevated about their pivotal connections, said head having bearing membersl supporting vwill move freely on-said guide pipe.

said blades for driving said blades upwardly, and sliding spring actuated means for forcing said blades outwardly as the blades are forced upwardly for causing said blades to engage the collar to be broken.

4. A collar burster comprising an operatinghead having a relatively large slot in the lower part thereof and bearm sockets in said slot, breaking blades pivotal y mounted in said sockets a guide pipe rigid with the lower part of said head, a plunger movable vertically in said pipe and through the lower part of said head into said slot and operatively connected to said blades, centering springs attached to said pipe at yits lower end and engaging said pipe loosely attheir upper ends, and centeringand friction springs attached to the lower end of said plunger and movablewith said plunger for controlling the movement of said plunger. 5. A collar burster comprising an operating head having a slot in the lower part thereof and bearing sockets in said slot,

breaking blades pivotally mounted in said sockets, a guide pipe rigid with the lower part of said head, a plunger movable vertically in said pipe and through the lower part of said head into said slot and operatively connected to said blades, centering springs attached to said lguide pipe, said guide pipe having a relatively long slot therethrough, friction and gulde springs, and means for mountin said springs on said plunger consisting o .a bolt projected through said slot and through the lower end of said plunger and nuts for positioning said springs on said bolt so that said springs In testimony whereof, I set my hand this 11th day of July, 1921.

HENRY C. LONSDALE. l n 

